Lift-jack for vehicles.



J. H. ABURKHOLDERI LI-FT JACK FOR VEHICLES.

APPLlcAloN man SEPT.B.19|3.

Patented Nov, 23, 1915.

LLU.

3 SHEETS-SHEET l.

HT T55 T M J. 'H. BURKHOLDER. LIFT JACK FoR vEHlcLEs.

I APPLICATION FILED SEPT-8.19l3. LMUL Patented Nov. 23, 1915.

3 SHEETS-SHEET 2.

\ MMM@ l. H. BURKHOLDER.

LIFT JACK Foa VEHICLES.

APPLICATION FILED SEPT. B, 1913. i 1911.191, luened Nov. 23, 1915.

3 SHEETS-SHEET 3.

COMP t n 1l A or ASHLAND, omo, Assienon 'ro 'ma nnrr'n nAnUrAcrnA-e on AsAnn, omo,

' LIFT-320K FUR VEHICL.

Menem.

pecication of Letters Patent.

Patented New. 23, Twt.

Application tiled September t, 1.918.y Serial Ito. 7,09.

To all whom it may` concern:

Be it known that I, JOHN H. BUnKHoLDnR, citizen of the United States, residing at Ashland, in the county of Ashland and State of Uhio, have invented certain new and useful Improvements in Lift-Jacks for Vehicles, of vwhich the following is a specification.

This invention has reference to lift jacks for vehicles, and the invention consists in the construction and combination of parts substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, Figure l is a vertical sectional elevation of the jack showing the parts in lifting position with the handle up and ready for a down stroke, and Fig. 2 is a vertical sectional elevation corresponding to Fig. l but showing the reverse Side of the jack and the handle at the end of its down stroke. Lifting occurs when the handle is depressed from Fig. 1 to Fig. 2. Fig. 3, Sheet 2, is a vertical sectional elevation of the jack showing the parts reversed as compared with Fig. l and adapted to lower the load, the handle being up, and Fig. 4 is a like section to Fig. 3 but showing the handle down. Lowering occurs when the handle is raised from Fig. 4 to Fig. 3. Fig. 5, Sheet 3, shows a front elevation of the jack and Fig. 6 is a cross section on line 6 6, Fi 2. Fig. 7 is a cross section on line 7 Fig. 2.A Fig. 8 is a perspective view of the outer portion or section of the housing and the reversing mechanism mounted therein.

The jack as thus shown has a standard s with a suitable base as usual and is a tubular part preferably rectangular in cross section and adapted to receive the lift member a as an insert from the top thereof. Thev said lift member has a series of teeth 2 along one edge, also as usual in this general class of jacks, and a single line of mechanlsm has to do with the operation of the jack both up and down, plus a tripping device'for reversing and lowering the load. The lever la. is.

pivotally supported in the housing fm. onv a bolt 3, and a pawl 4 is pivoted between ears or extensions 5 on said handle behind said pivot in position to engage and operate the ratchet wheel 7. The said wheel is mountedV on a suitable shaft 8, and a spring holds the pawl 4 up in engagement therewith. 'A

.check pawl, 1o, in the top ef the Said houslatter pawl 1s a take-up for the ratchet wheel under actuations by lever l1. and pawl 4 below, and remains in engagement with said ratchet wheel under spring pressure unless especlally suspended or relieved. As to this latter feature we shall see presently. When the lift member a is being raised, as in Figs. 1 and 2, the pawl l0 is down to hold the rotations of the lsaid ratchet wheel, but when the lift member is to be lowered` with its load the pawl 10 is. thrown back at'suitable intervals out of engaging relations with said ratchet so as to allow the ratchet to turn reversely. This occurs when the lever la is being raised as the pawl 4 is then drawn back and the ratchet wheel rotates reversely in proportion, the pawl l0 being lifted out at this time for this purpose.

Aso-called tripping mechanism intervenes the two pawls 4 and 10 to effect-,this reversal and is so 'constructed and arranged that the lload can be lowered by the strokes of the lever the same as it is raised, only that action in` one case is by lowering'the handle and in the other by raising it and the trip mechanism takes care of the differences in the two movements. Thus, the tripping device d is a flat .piece of metal preferably cast and having the rather peculiar shape shown and mounted on a pivot l1 on the outer section of the housing g. The said device has a recessed lower end 15 adapted to engage a pin 16 on the side'and end of pawl 4 while the upper end has .its extremlty provided with an inclined edge 18 adapted to engage a pin or projection 20 on the side and end ofl pawl 10. This serves to raise and hold the said pawl out of engaging position withl ratchet wheel 7 during the short interval of reversal of the saidl wheel after which said pawl drops back into engagement with the Wheel and holds it till the next corresponding movement of lever I1.. is made, when theoperation is repeated. On the other hand when the load is being raised the tripping member d is thrown entirely out of operat ing position by means of a cam lever 2,5'`

. and thusthrow the said member from position Fig. 1 to position Fig. 3. A measured movement or swing of approximately half an inch'at each end effects these changes of position. f,

Assuming now that the parts are set for reversal and the handle down, Fig. 4, the raising of the handle withdraws pawl 4 the distance say of one tooth but the tooth follows the withdrawal because when this occurs the trip member d has already raised the upper pawl 10, as also seen 1n Fig. 4, wherein the side pin 20 thereon rests on the extremity of said member and holds the pawl out. Obviously, also, the lever h 1s 1n handas this operation takes place so there is no danger of undue action. Then as the lever htakes the raised position and the top of the member ,is swung to the right by the pin 16 engaging on the lower end thereof and pulling it back against the tension of the wire spring 19 as the lever is ralsed the upper pawl 10 is free `tordrop into the next succeeding tooth and pin 16 below at last rides down into the bottom recess 15 and makes sure the changed position and the en- 4 gagement of pawl 10 in the rachet. Pawl 4 is free as this occurs and as it is thrown forward out 'of recess 15 to take the next forward tooth and repeat the retiring action of the ratchet wheel, and so on until the lift member has been lowered its full extent.

The shaft 8 which carries the ratchet l wheel 7 also carries a gear or pinion 30 mounted in a housing 30 ofits own outside of housing g and engaging the teeth 2 of the lift member as seen in Fig. 2. The said pinion or gear is approximately one-third.

the size of the ratchet wheel 7 through which it is actuated, so that the power applied through the said ratchet isfcompounded and a jack is produced which is especially adapted for use with motor trucks and other heavy vehicles. It also is material that both the ratchet wheel and the pinion are on the same shaft and practically side by side though the wall of housing g intervenes. It will be noticed also that all the operating mechanism is assembled on what may be termed the front of the standard and in the most compact relation possible. This leaves the rear of the jack unobstructed and adapted to take positions not otherwise possible, as where a portion of the mechanism is placed at the rear of the standard.

What I `claim is:

1. A vehicle jack having a standard and a lift member slidable therein and provided with a series of teeth along its front edge, a shaft through said standard and a pinion thereon engaging the said teeth, a ratchet wheel mounted on said shaft relatively at one side of the plane of said standard and lift member, an operating lever pivotally mounted beneath said wheel and a pawl'on the end thereof eccentric to the pivot of said lever and engaging said wheel ratchet from beneath, to exert an upward lifting action thereon while imparting rotation thereto.

2. A vehicle jack having a standard and a toothed lift member therein, a shaft and a pinion mounted thereon engaging said lift member, a ratchet wheel mounted on said shaft, and a pivoted lever having a pawl extending beneath and engaging the underside of said ratchet wheel in combination with a tripping device for said pawl mounted in juxtaposition to said wheel upon a pivot pin stationed off center relatively to the said shaft.

3. The jack described having a lift member and a ratchet wheel and means therewith to operate the lift member comprising a lever and an actuating pawl, a check pawl engaging said Wheel, and a trip member pivotally supported between said pawls at one side of the axis of said wheel and adapted to operateA in conjunction with both to effect reversal of said lift member, the said tripping member being adapted to come into operating engagement with both said pawls at predetermined times.

4. The jack described having a toothed lift member and a pinion engaging the same, a ratchet wheel in actuating relations with said pinion, anactuating awl, and a check pawl engaging said whee in combination with a trip member pivotall supported centrally between its ends andY adapted to engage its ends with both said pawls successively and effect the reversal of said lift and a spring and reversing lever for said trip member.

5. A jack having a lift member with teeth at one side and means to raise and lower the same comprising a pinion in meshl with said teeth, a ratchet wheel, an actuating pawl, and a check pawl, in combination with a removable side plate for said jack having a tripping device pivotally mounted upon its inner face and removable therewith and adapted' to engage both said pawls for reversal of said lift member, and a controlling lever to set said tripping member for action.

6. In a lifting jack, the combination of an actuating ratchet wheel, an actuating lever,

an actuating pawl on said lever coacting with said ratchet wheel, a holding pawl disposed 'oppositely to said actuating pawl, springs for said pawls, a spring actuated pivotally mounted reversing member disposed between said pawls to swing forward and disengage said holding pawl when said pawl is relieved of its load, said reversing plate being engaged by the actuating pawl on the lowering stroke of the lever and actuated against its spring to permit the reengagement of said holding pawl, said actuating pawl being disen 'aged on being relieved of its load, by sai reversing member, and being held thereby from rengagement with said ratchet during the return stroke of the lever, and means for -retaining said reversing member in its inoperative position.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN H. BURKHOLDER. Witnesses:

E. M. FISHER, F. C. MUssUN. 

